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Related Experiment Video

Updated: Jun 22, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Shear dynamo problem: Quasilinear kinematic theory.

S Sridhar¹, Kandaswamy Subramanian

¹Raman Research Institute, Sadashivanagar, Bangalore 560 080, India. ssridhar@rri.res.in

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|June 13, 2009

Summary

This summary is machine-generated.

Large-scale dynamo action in turbulent shear flows is investigated. The study finds that while shear-current dynamos are absent for nonhelical turbulence, large-scale dynamo action is still possible.

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Last Updated: Jun 22, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Area of Science:

Astrophysics
Plasma Physics
Geophysics

Background:

Turbulence plays a crucial role in astrophysical and geophysical phenomena, including the generation of magnetic fields.
Understanding large-scale dynamo action is essential for explaining phenomena like planetary magnetic fields and galactic dynamos.

Purpose of the Study:

To investigate large-scale dynamo action in turbulent shear flows.
To analyze the influence of linear shear flow on turbulent dynamo processes.
To determine the conditions under which dynamo action can occur in such systems.

Main Methods:

A quasilinear and kinematic treatment of turbulence in the presence of linear shear flow.
Derivation of the integrodifferential equation for the mean magnetic field evolution.
Systematic use of shearing coordinate transformation and Galilean invariance.

Main Results:

The time evolution of cross-shear magnetic field components is independent of other components for nonhelical turbulence.
This independence holds for any Galilean-invariant velocity field.
Shear-current assisted dynamo action is found to be essentially absent under these conditions.

Conclusions:

Large-scale dynamo action in turbulent shear flows is complex and depends on the helical nature of turbulence.
While shear-current assistance is ruled out for nonhelical turbulence, other mechanisms for large-scale dynamo action remain possible.
The findings contribute to a deeper understanding of magnetic field generation in various physical systems.